Hemi-Sync is short for Hemispheric Synchronization. Hemi-Sync is also known as brainwave synchronization. Monroe indicated that the technique synchronizes the two hemispheres of one’s brain, thereby creating a ‘frequency-following response’ designed to evoke certain effects. Hemi-Sync has been used for many purposes, including brainwave cds, guided meditation, stress management, relaxation music, brain wave cds, improved concentration, audio-guidance cds, hemispheric synchronization, personal development, spiritual healing.